CN104954071B - A kind of digital Optical fiber relay systems of LTE Advanced and its implementation - Google Patents
A kind of digital Optical fiber relay systems of LTE Advanced and its implementation Download PDFInfo
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Abstract
The present invention relates to a kind of digital Optical fiber relay systems of LTE Advanced and its implementation, the system includes：Proximal device and remote equipment；The implementation method includes：Proximal device goes out signal from LTE Advanced information source base stations couples, and carries out analog-to-digital conversion and opto-electronic conversion to signal, while using optical fibers as the transmission that transmission medium carries out signal；The optical signal received by optical fiber is recovered data signal by remote equipment through photoelectric conversion module conversion, through Digital Signal Processing and digital-to-analogue conversion, is finally sent to user terminal.A kind of LTE Advanced base stations proposed by the invention are used as return link using fiber channel so that the characteristics of system has with roomy, good reliability；Radiofrequency signal is digitized using digital technology, data signal handled in numeric field, processing and control ability of the equipment to signal is greatly enhanced.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of digital Optical fiber relay systems of LTE-Advanced and
Its implementation.
Background technology
3GPP Long Term Evolutions（Long Term Evolution, LTE）Project is on UTRA（Universal
Terrestrial Radio Access, Universal Terrestrial wireless access）And UTRAN（Universal Terrestrial
Radio Access Network, Universal Terrestrial wireless access network）Improved project, is to the whole network including core net
Technological evolvement.LTE is also referred to as 3.9G by popular, the peak-data download capabilities with 100 Mbps, be considered from 3G to
The mainstream technology of 4G evolution.LTE-Advanced（Abbreviation LTE-A）System is LTE smooth evolution, is had to LTE very strong simultaneous
Capacitive.LTE-A supports the Gbit/s of the downlink peak rates 1 and Mbit/s of upstream peak speed 500 requirement, while emphasizing reduction
The demand such as terminal and the cost and power consumption of network.In order to reach the rate requirement of uplink/downlink, LTE-A introduces carrier aggregation, many
User MIMO, multi-point cooperative transmission（Coordinative Multiple Point, CoMP）, relaying（Relay）Etc. new technology
In the hope of the higher spectrum efficiency of acquisition and throughput.
In order to meet LTE-A high power capacity demand, system must operate in very wide bandwidth frequency range, i.e. system can only be
Worked at higher frequency range, but penetration loss and path loss are all very big at high band, it is achieved that a wide range of covering
Difficulty it is also just bigger.In this context, raising power system capacity, increase coverage, lifting Cell Edge User are possessed
Communication quality, the relaying technique for reducing many advantages such as cost become the focus of people's extensive concern, are used as LTE-A key
One of technology, the problems such as relaying technique is the covering of solution system, lifting system handling capacity provides good solution.
During the data transfer of junction network, transmitting terminal transfers data to relay station first, then by relay station
It is forwarded to destination node.Shorten the distance between user and antenna by relaying technique, so that reaching improves the mesh of link-quality
, so just can effective lifting system message transmission rate and spectrum efficiency.Meanwhile, if in the original coverage deployment of cell
Relay station, may also reach up the purpose of lifting system capacity.
Current LTE-A relaying techniques are mainly based upon wireless relay, due to the multipath fading in wireless channel,
Base station and relay station are relatively low using the mode reliability being wirelessly transferred, and wireless relaying technique is inserting a new section for network
While point, new interference source is also brought so that the interference structure of system is more complicated.In order to relay station and base station it
Between carry out effective time-frequency resource allocating, being likely to require could be realized by scheduling of resource or frame structure design.In addition, drawing
Enter after full-featured relay station, relative control channel, common signal channel, physical process etc. are also required to be set again
Meter.Meanwhile, in return link, if wireless channel, which is only used only, transmits signal, it is impossible to ensure that relay station provides the speed of service
Rate and capacity, therefore need a kind of efficient solution badly to lift the return link quality of LTE-A relay system.
The content of the invention
It is an object of the invention to provide a kind of digital Optical fiber relay systems of LTE-Advanced and its implementation, with
Overcome defect present in prior art.
To achieve the above object, the technical scheme is that：A kind of digital Optical fiber relay systems of LTE-Advanced,
Including a proximal device and a remote equipment；One end of the proximal device is through coupler and LTE-Advanced information sources base station phase
Even, sent and radiofrequency signal after being coupled through the coupler for receiving the LTE-Advanced information sources base station, and should
Radiofrequency signal is transmitted to the remote equipment after being handled through the proximal device；One end of the remote equipment through return link with
The other end of the proximal device is connected, and the other end of the remote equipment is connected through access link with user equipment, described remote
End equipment is used to receive the signal handled through the proximal device, and the signal is transmitted to the user equipment；The distal end
Equipment is additionally operable to the signal that the user equipment is uploaded being uploaded to the proximal device, and the proximal device sets the distal end
The standby signal uploaded is through the coupler transfer to the LTE-Advanced information sources base station.
In an embodiment of the present invention, a first duplexer, one the oneth AD that the proximal device includes being sequentially connected turn
Block and one first optical module are changed the mold, the duplexer is connected through return link with the coupler；The duplexer is through described
Coupler receives the analog radio-frequency signal after coupling, and the analog radio-frequency signal is converted into number through first AD conversion module
Word signal, then transmitted through optical fiber to the remote equipment after the data signal is converted into optical signal through first optical module.
In an embodiment of the present invention, the remote equipment includes one second optical module, the DSP numerals being sequentially connected
Signal processing module, a digital beam forming module, one first D/A conversion module, one second duplexer and an antenna；It is described
Second optical module is received after the proximal device processing and transmitted through optical fiber to the optical signal of the remote equipment, and the light is believed
Number be converted to digital radio signal；The digital radio signal is carried out Digital Signal Processing by the DSP digital signal processing modules
After transmit to the digital beam forming module；First D/A conversion module will be after the digital beam forming resume module
Digital radio signal be converted to analog radio-frequency signal, and through second duplexer and the antenna, passed by access link
Transport to the user equipment.
In an embodiment of the present invention, the proximal device also includes one first monitoring module and one first power module；
The remote equipment also includes one second monitoring module and a second source module.
In an embodiment of the present invention, the return link uses optical fiber, is set for the remote equipment with the near-end
Communication between standby；The access link is wireless transmission channel, for the remote equipment and the user of access relay services
Equipment is communicated.
In an embodiment of the present invention, the remote equipment also includes one second AD conversion module, the second AD conversion mould
Block is connected with second duplexer and the digital beam forming module respectively；Second AD conversion module is through described
Two duplexers and the antenna, the analog radio-frequency signal that the user equipment is sent is received by the access link, and should
Analog radio-frequency signal is converted to digital radio signal, the digital beam forming module and the DSP digital radio signals module
Digital Signal Processing is carried out to the digital radio signal, and the data signal after processing is converted into light through second optical module
Signal, is transmitted through the fiber to the proximal device.
In an embodiment of the present invention, the proximal device also includes one second D/A conversion module, the 2nd DA moduluss of conversion
Block is connected with first optical module and the first duplexer respectively；First optical module receives described remote by optical fiber
The optical signal of end equipment transmission, data signal is converted into through first optical module, and second D/A conversion module believes the numeral
Analog radio-frequency signal number is converted into, and the LTE- is sent to after the first duplexer and coupler coupling
Advanced information sources base station.
Further, a kind of LTE-Advanced implementation methods of digital Optical fiber relay system, proximal device are also provided
In first duplexer sent by cable reception through LTE-Advanced information sources base station and the simulation after being coupled through coupler is penetrated
Frequency signal, and the analog radio-frequency signal is converted into data signal through the first AD conversion module, then count this through the first optical module
Word signal is converted to after optical signal and transmitted through return link to remote equipment；The second optical module in the remote equipment is received should
Optical signal, and the optical signal is converted to transmitted after digital radio signal to DSP digital signal processing modules；The DSP numerals
Signal processing module is transmitted to digital beam forming module after the digital radio signal is carried out into Digital Signal Processing；First DA turns
Digital radio signal after the digital beam forming resume module is converted to analog radio-frequency signal by mold changing block, and through second
Duplexer and antenna, are transmitted to user equipment by access link.
In an embodiment of the present invention, the second AD conversion module in the remote equipment is through second duplexer and institute
Antenna is stated, the analog radio-frequency signal that the user equipment is sent is received by the access link, and by the analog radio-frequency signal
Digital radio signal is converted to, the digital beam forming module and the DSP digital radio signals module are to the digital RF
Signal carries out Digital Signal Processing, and the data signal after processing is converted into optical signal through second optical module, passes through institute
Return link is stated to transmit to the proximal device；First optical module receives the optical signal by optical fiber, and through first light
The data signal is converted into analog radio frequency letter by the second D/A conversion module that module is converted into data signal, the proximal device
Number, and it is sent to the LTE-Advanced information sources base station after the first duplexer and coupler coupling.
Compared to prior art, the invention has the advantages that：A kind of LTE-Advanced proposed by the invention
Digital Optical fiber relay system and its implementation, due to the LTE-Advanced relay systems using digital technology RF radio frequencies
Signal is digitized, and data signal is handled in numeric field, greatly enhances processing and control of the equipment to signal
Ability；As a result of digital beam forming technology so that beam angle for terminal and inter base station communication is narrower, more collect
In, therefore received signal to noise ratio is improved, correspondingly also improve the bandwidth of terminal user（Speed）And service quality（QoS）, use
Family experience is obviously improved；Meanwhile, the user of access service while narrow beam enables the relay station to support more.In addition, should
Relay system can support the MHz frequency ranges of 700MHz ~ 5850, can neatly support 3G, LTE, LTE-A, WiFi, and compatible future
5G systems.
Brief description of the drawings
Fig. 1 is the link structure schematic diagram of the digital Optical fiber relay systems of LTE-Advanced in an example of the invention.
Fig. 2 is proximal device circuit theory in the digital Optical fiber relay systems of LTE-Advanced in an example of the invention
Figure.
Fig. 3 is remote equipment circuit theory in the digital Optical fiber relay systems of LTE-Advanced in an example of the invention
Figure.
Fig. 4 is the star net forming schematic diagram in the digital Optical fiber relay systems of LTE-Advanced in an example of the invention.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
The present invention provides a kind of digital Optical fiber relay systems of LTE-Advanced, as shown in Fig. 1 ~ Fig. 3, including a near-end
Equipment and a remote equipment；One end of the proximal device is connected through coupler with LTE-Advanced information sources base station, for connecing
The radiofrequency signal after the LTE-Advanced information sources base station sends and coupled through the coupler is received, and the radiofrequency signal is passed through
Transmitted after the proximal device processing to the remote equipment；One end of the remote equipment is set through return link with the near-end
The standby other end is connected, and the other end of the remote equipment is connected through access link with user equipment (UE), and the remote equipment is used
The signal handled in reception through the proximal device, and the signal is transmitted to the user equipment (UE)；The remote equipment is also
Signal for the user equipment (UE) to be uploaded is uploaded to the proximal device, and the proximal device is by the remote equipment
The signal of biography is through the coupler transfer to the LTE-Advanced information sources base station.
Further, as shown in Fig. 2 in the present embodiment, the proximal device includes one first duplex being sequentially connected
Device, one first AD conversion module and one first optical module, the duplexer are connected through return link with the coupler；And
In the downlink of the return link, the duplexer receives the analog radio-frequency signal after coupling through the coupler, and will
The analog radio-frequency signal is converted to data signal through first AD conversion module, then believes the numeral through first optical module
Number be converted to after optical signal and to be transmitted through optical fiber to the remote equipment.
Further, as shown in figure 3, in the present embodiment, the remote equipment includes one second optical mode being sequentially connected
Block, a DSP digital signal processing modules, a digital beam forming module, one first D/A conversion module, one second duplexer and
One antenna；And in the downlink that the remote equipment is connected with the proximal device, second optical module receives described
After proximal device processing and transmitted through optical fiber to the optical signal of the remote equipment, and the optical signal is converted into digital RF letter
Number；The DSP digital signal processing modules are transmitted to the digital wave after the digital radio signal is carried out into Digital Signal Processing
Beam figuration module；First D/A conversion module changes the digital radio signal after the digital beam forming resume module
For analog radio-frequency signal, and through second duplexer and the antenna, transmitted by access link to the user equipment (UE).
Further, as shown in Figures 2 and 3, in the present embodiment, the proximal device also includes one first monitoring module
With one first power module；The remote equipment also includes one second monitoring module and a second source module.
Further, in the present embodiment, the return link uses optical fiber, for the remote equipment and the near-end
Communication between equipment；The access link uses antenna, and the access link is wireless transmission channel, is set for the distal end
The standby user equipment (UE) with accessing relay services is communicated.
Further, in embodiment, as shown in figure 3, the remote equipment also includes one second AD conversion module, this
Two AD conversion modules are connected with second duplexer and the digital beam forming module respectively；And in the access link
Up-link in, second AD conversion module is connect through second duplexer and the antenna by the access link
The analog radio-frequency signal that the user equipment (UE) is sent is received, and the analog radio-frequency signal is converted into digital radio signal, it is described
Digital beam forming module and the DSP digital radio signals module carry out Digital Signal Processing to the digital radio signal, and
Data signal after processing is converted into optical signal through second optical module, the proximal device is transmitted through the fiber to.
Further, in embodiment, as shown in Fig. 2 the proximal device also includes one second D/A conversion module, this
Two D/A conversion modules are connected with first optical module and the first duplexer respectively；And in the up of the return link
In link, first optical module receives the optical signal that the remote equipment is transmitted by optical fiber, is changed through first optical module
Into data signal, the data signal is converted into analog radio-frequency signal by second D/A conversion module, and through the described first duplex
The LTE-Advanced information sources base station is sent to after device and coupler coupling.
Further, in order to allow skilled in the art realises that a kind of LTE-Advanced proposed by the invention is digital
Optical fiber relay system, the implementation method for also providing a kind of digital Optical fiber relay systems of LTE-Advanced is made specifically to it
It is bright.
First duplexer in proximal device is sent and coupled by cable reception through LTE-Advanced information sources base station
Analog radio-frequency signal after device coupling, and the analog radio-frequency signal is converted into data signal through the first AD conversion module, then
Transmitted after the data signal is converted into optical signal through the first optical module through return link to remote equipment；In the remote equipment
The second optical module receive the optical signal, and the optical signal is converted into digital radio signal to DSP digital signal processing modules；
The DSP digital signal processing modules are transmitted to digital beam forming mould after the digital radio signal is carried out into Digital Signal Processing
Block；Digital radio signal after the digital beam forming resume module is converted to analog radio frequency letter by the first D/A conversion module
Number, and through the second duplexer and antenna, transmitted by access link to user equipment (UE).
Further, in the present embodiment, the second AD conversion module in the remote equipment is through second duplexer
With the antenna, the analog radio-frequency signal that the user equipment (UE) is sent is received by the access link, and the simulation is penetrated
Frequency signal is converted to digital radio signal, and the digital beam forming module and the DSP digital radio signals module are to the number
Word radiofrequency signal carries out Digital Signal Processing, and the data signal after processing is converted into optical signal through second optical module,
Transmitted by the return link to the proximal device；First optical module receives the optical signal by optical fiber, and through being somebody's turn to do
The data signal is converted into simulation by the second D/A conversion module that the first optical module is converted into data signal, the proximal device
Radiofrequency signal, and it is sent to the LTE-Advanced information sources base after the first duplexer and coupler coupling
Stand.
In addition, in the present embodiment, in order to improve the flexibility of relay system deployment, as shown in figure 4, the LTE-
The digital Optical fiber relay systems of Advanced support star net forming mode.
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, produced function is made
During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (1)
1. a kind of digital Optical fiber relay systems of LTE-Advanced, it is characterised in that set including a proximal device and a distal end
It is standby；One end of the proximal device is connected through coupler with LTE-Advanced information sources base station, for receiving the LTE-
Advanced information sources base station is sent and the radiofrequency signal after coupler coupling, and the radiofrequency signal is set through the near-end
Transmitted after standby processing to the remote equipment；The other end of the one end of the remote equipment through return link Yu the proximal device
It is connected, the other end of the remote equipment is connected through access link with user equipment, the remote equipment is used to receive through described
The signal of proximal device processing, and the signal is transmitted to the user equipment；The remote equipment is additionally operable to the user
The signal that equipment is uploaded is uploaded to the proximal device, and the signal that the proximal device uploads the remote equipment is through the coupling
Clutch is transmitted to the LTE-Advanced information sources base station；
The proximal device includes a first duplexer, one first AD conversion module and one first optical module being sequentially connected,
The first duplexer is connected through cable with the coupler；The first duplexer receives the mould after coupling through the coupler
Intend radiofrequency signal, and the analog radio-frequency signal is converted into data signal through first AD conversion module, then through described first
The data signal is converted to after optical signal and transmitted through return link to the remote equipment by optical module；
One second optical module, a DSP digital signal processing modules, a digital beam that the remote equipment includes being sequentially connected are assigned
Shape module, one first D/A conversion module, one second duplexer and an antenna；Second optical module receives the proximal device
Transmitted after processing and through return link to the optical signal of the remote equipment, and the optical signal is converted into digital radio signal；
The digital radio signal transmit after Digital Signal Processing to the digital beam and assigned by the DSP digital signal processing modules
Shape module；Digital radio signal after the digital beam forming resume module is converted to mould by first D/A conversion module
Intend radiofrequency signal, and through second duplexer and the antenna, transmitted by access link to the user equipment；
The proximal device also includes one first monitoring module and one first power module；The remote equipment also includes one second
Monitoring module and a second source module；
The return link uses optical fiber, for the communication between the remote equipment and the proximal device；The access chain
Road is wireless transmission channel, is communicated for the remote equipment with accessing the user equipment of relay services；
The remote equipment also include one second AD conversion module, second AD conversion module respectively with second duplexer with
And the digital beam forming module is connected；Second AD conversion module passes through through second duplexer and the antenna
The access link receives the analog radio-frequency signal that the user equipment is sent, and the analog radio-frequency signal is converted into numeral penetrated
Frequency signal, the digital beam forming module and the DSP digital radio signals module carry out numeral to the digital radio signal
Signal transacting, and the data signal after processing is converted into optical signal through second optical module, it is transmitted through the fiber to described
Proximal device；
The proximal device also include one second D/A conversion module, second D/A conversion module respectively with first optical module with
And the first duplexer is connected；First optical module receives the optical signal that the remote equipment is transmitted by optical fiber, through this
First optical module is converted into data signal, and the data signal is converted into analog radio-frequency signal by second D/A conversion module, and
The LTE-Advanced information sources base station is sent to after the first duplexer and coupler coupling；
First duplexer in proximal device is sent by cable reception through LTE-Advanced information sources base station and through coupler coupling
Analog radio-frequency signal after conjunction, and the analog radio-frequency signal is converted into data signal through the first AD conversion module, then through first
The data signal is converted to after optical signal and transmitted through return link to remote equipment by optical module；Second in the remote equipment
Optical module receives the optical signal, and the optical signal is converted to transmitted after digital radio signal to DSP digital signal processing modules；
The DSP digital signal processing modules are transmitted to digital beam forming mould after the digital radio signal is carried out into Digital Signal Processing
Block；Digital radio signal after the digital beam forming resume module is converted to analog radio frequency letter by the first D/A conversion module
Number, and through the second duplexer and antenna, transmitted by access link to user equipment；
The second AD conversion module in the remote equipment passes through the access link through second duplexer and the antenna
The analog radio-frequency signal that the user equipment is sent is received, and the analog radio-frequency signal is converted into digital radio signal, it is described
Digital beam forming module and the DSP digital radio signals module carry out Digital Signal Processing to the digital radio signal, and
Data signal after processing is converted into optical signal through second optical module, transmitted by the return link to the near-end
Equipment；First optical module receives the optical signal by optical fiber, and is converted into data signal through first optical module, described near
The data signal is converted into analog radio-frequency signal by the second D/A conversion module in end equipment, and through the first duplexer and
The LTE-Advanced information sources base station is sent to after the coupler coupling.
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| CN107040319B (en) * | 2016-02-03 | 2018-09-18 | 奇点新源国际技术开发(北京)有限公司 | Response message retransmission method, apparatus and system |
| CN109462438B (en) * | 2019-01-02 | 2020-07-31 | 京信通信系统（中国）有限公司 | Relay network element equipment, remote network element equipment and optical fiber distributed system |
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